62results about How to "Production goes straight" patented technology

The invention relates to the field of manufacturing of high-quality metal materials, in particular to a method for adding rare earth metal into steel to improve the performance. In the smelting process of molten steel, the degree of purity of the molten steel and the degree of purity of the high-purity rare earth metal are strictly controlled; the high-purity rare earth metal is added into a steel ladle; the content of sulfur in the molten steel is below 200 ppm and the total oxygen content is below 40 ppm before the high-purity rare earth metal is added; and the total oxygen content of the added high-purity rare earth metal is below 200 ppm. The method is applicable to the processes such as a converter BOF-ladle refining LF-vacuum degassing RH or VD-continuous casting CC / mold casting MC flow, an electric arc furnace EAF-ladle refining LF-vacuum degassing RH or VD-continuous casting CC / mold casting MC flow and a converter BOF / intermediate frequency furnace GOR / AOD(-ladle refining LF)-continuous casting CC / mold casting MC flow, prepares high-quality carbon structural steel, low alloy steel, medium-high alloy steel, tool and mould steel, bearing steel, spring steel, stainless steel and electrical steel, and solves the bottleneck problems that due to a conventional rare earth adding process, the performance of rolled steel is not stable and a water gap is blocked in the production process.

The invention relates to a sodium-translated roasting method of vanadium minerals, belonging to the field of metallurgy and mainly aiming to solve the technical problem on providing a sodium-translated roasting method of vanadium minerals. The total vanadium content into a furnace in the method can reach more than 6%. The sodium-translated roasting method of the vanadium minerals comprises the following steps of: (a) mixing raw materials: pulverizing the vanadium minerals, removing metal iron, uniformly mixing sodium salt and the vanadium minerals with metal iron removed, wherein the weight of the sodium salt is 9-11% of the weight of the vanadium minerals with metal iron removed, and the sodium salt is at least one of NaCl, Na2SO4 and Na2CO3; and (b) roasting: roasting the mixed raw materials under aerobic conditions to obtain pentavalent salt of vanadium, wherein the roasting temperature is 700-900 DEG C, and the roasting time is 3.5-5.0 h. The method provides a new selection for the sodium-translated roasting of the vanadium minerals and has broad application prospects.

The invention provides a decarburization and annealing process of high-carbon middle-and-low-grade cold rolling orientation-free silicon steel. In the process, a horizontal type continuous decarburization and annealing coating unit is adopted, the thickness of a steel belt is 0.35-0.65mm, the operation speed of the steel belt is controlled to 70-100m / min, the tension of the steel belt in a continuous decarburization and annealing furnace is 1800-2200N; the temperatures of various furnace sections are controlled as follows: the furnace temperature of a preheating / oxidation-free heating section is 1000-1100 DEG C, the furnace temperature of a radiant tube heating section is 900-920 DEG C, and the furnace temperature of a soaking section is 850-910 DGE C; apertures of a fan at a cooling section are 25-99% in turn; the pressures in the furnace are as follows: the pressure of an inlet is 25-30Pa, and the pressure of an outlet is 45-50Pa; and H2 and N2 are adopted as protective gas in the furnace, wherein the content of H2 is 25%-35%, the dew point value of the protective gas is 35+ / -5 DEG C, and the flux of the protective gas is 350-420m<3> / h. In the invention, the process is adopted so as to not only ensure that the steel belt is smooth, the magnetic property, magnetic ageing and the like of the steel belt meet technical requirements, the qualified rate of a finished product is improved and waste quantity is reduced but also ensure that production is smoothly carried out.

The invention relates to the technical field of strip steel rolling, in particular to a control method and equipment for stitching centering of thin strip steel in a continuous annealing furnace. The present invention adopts a set of centering devices and a set of side measuring devices before and after the sewing equipment. Whether the running strip and the rear strip are aligned, that is, whether the centerline of the strip is parallel to the centerline of the unit. At the same time, a transverse hydraulic cylinder and a rotary hydraulic cylinder are respectively installed at the front and rear of the sewing equipment. Through the cooperation of the first deviation correction roller and the second deviation correction roller, the front and rear strips of the sewing equipment can be aligned and centered, which can greatly improve the sewing quality. Accuracy, reduce the risk of belt breakage of the unit, and make production run more smoothly. The invention solves the technical problem that the stitching accuracy of the existing control method is poor, especially when the width of the front and rear strips is inconsistent, and there is a risk of strip breakage.

The invention provides machining equipment for vanadium-titanium magnetite and a machining technology of the vanadium-titanium magnetite. The equipment comprises a batching unit, a drying unit, a pellet manufacturing unit, a reducing unit and a separating unit, wherein the batching unit comprises a batching chamber, and the batching chamber is internally provided with a stirring assembly; the drying unit comprises a drying chamber, the drying chamber is internally provided with a heating assembly, and the drying chamber is used for receiving raw materials conveyed out of the batching chamber;the pellet manufacturing unit is used for manufacturing the dried raw materials into pellets, and the reducing unit comprises a reductive vertical furnace, and the reductive vertical furnace is provided with a feeding port, a discharging port, an air inlet and an air outlet; and the pellets enter the reductive vertical furnace from the feeding port, and the separating unit comprises a melt separation furnace; and the discharging port communicates with the melt separation furnace. The machining and manufacturing operation of the vanadium-titanium magnetite is convenient and reliable, the manufactured product is high in value, and the utilization rate of the raw materials is high.

The invention discloses peritectic steel continuous casting covering slag, which comprises the following components in percentage by weight: 70 to 78 percent of calcium silicate, 4.5 to 8.5 percent of kieselguhr, 4.5 to 9.5 percent of insulating brick powder, 1 to 7 percent of cryolite, 1 to 7 percent of high-temperature aluminum oxide, 0.5 to 4.5 percent of carbon black, 1 to 5 percent of petroleum coke and 0.5 to 5 percent of expanded graphite. The invention has the advantages that: the peritectic steel continuous casting covering slag has high physical performance and operational performance, and can meet the requirement of peritectic steel continuous casting production of steelmaking enterprises in China at present and create huge economic and social benefits; and the invention has the characteristics that: 1, the covering slag overcomes the surface defects of casting blanks effectively, and the defective index can be reduced by over 20 percent; 2, the covering slag special for special steel can be used for producing the special steel which are not produced previously; and 3, the covering slag is stable, ensures that the production is smooth, and prevents loss caused by accidents such as bleed-out and the like.